Question

X+(7,74+3,9)=18,7

 

Answer 1

X+(7,74+3,9)=18,7

X+11,64=18,7

X=18,7-11,64

X=7,06

Answer 2

X + (7,74 + 3,9) = 18,7

⇔ X + 11,64 = 18,7

⇔ X = 18,7 - 11,64

⇔ X = 7,06

Answer 3

\(x+\left(7,74+3,9\right)=18,7\)

\(x+11,64=18,7\)

\(x=18,7-11,64\\ x=7,06\)